Centrifugal screen.



O. M. GRUENDER. CENTRIFUGAL SCREEN.

I APPLICATION FILED IuLv 30. Ism.

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Patented Nov, 5,1918;l

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0SCAR`M. GRUENJDEBJ, CHEGAGUiEElGlE-ITS, liLIiNUliS.

Application filed July 30, 1,917.. Serial No. Mdel.

To all whom t 'may concern: y

,Be it lenovvn that l, @scan M. GRUENDER, a citizen of `the UnitedStates,`,1esidii1g .at .Chicago Alf'ieights, in the .county `ofCook VandSta-te of Illinois, have invented `a `certa'ni new and useful.Improvement in Centrifugal Screens, of Which `the following is aspecili'cation.

My invention relates to improvements in centrifugal screens particularlysuch .screens as are provided with means `fior simultaneously vibratingyor oscillating the screen surface to assist `in .the .screeningprocessand to protect the 4screens against blindinor. @ne `object yof myinvention is to `provide .a .new and improved .arrangement whereby .thescreens vthemeelvesimay be much more durable `and may be protectedagainst undue shocks, jolts and liars `and wherein the vibration effectwhile effective for thepurpose `of keeping the screen meshes `fromblinding and for thepurpose of .assisting in `screening will not resultin lsnappin, .f r or breaking the screen fabric itself. Another objectis to `,provide .a screen of this :tyipe which will be llsi-niple andeasy to manufacture. require a minimum power for operation: vvill be .entrernely durable and convenient. Other objects vvill appear from timetotime ithrouglr out the specification.

My invention is illustrated more or less diagrammatically in theaccompanying draw ings wherein- Figure l is a `vertical section;

Fig. 2 .is .a plan of the screen with seueral screen sections removed,and parts broken away to show the frame and associated parts;

Fig. 3 is a plan of one of the` screen sec tions;

Fig. l is a section on an enlarged scale along the line .fl-a 'of Fig.`2;

Fig. y5 is a part section in part elevation on. :au .enlargedVscale-with parts omitted on plane .perpendicular to kthe plane of thesection ofFig. 1,;

Fig. 6 ig .a .section alongthe line 6-*6 of riga.

Specification of LettersPatent.

Patented Nov.. o, leid..

A5 A5 are spacing sleeves `interpfosed be- .ttveen the hopper A3 and `aninner hopper Athe parte being held in fixed position. by

,means .ofthe bolts and nuts A7 as indicated.

The hopper A discharges through a pipe AS passing through the wall ofthehopper lt is understood that the hopper A3 is iframe is `bolted inposition as indicated .and

carries at its `center ra cylindrical box or roller .housing B1. Thisbox `or roller housing Blais provided with an upwardly lextendingouterflange or Wall B2 and .aleentral upwardly extending boss B3.Radially arranged shafts Bf are supported `at their inner Wall B2 and`boss B3 and have rotatably mounted thereon the rollers B5. I have shownthese rollers diametrically o.p posed and two in number.` @bviously itmight be possible to change the number or arrangement ofthese rollersIdepending on the circumstances of the `case and particularly upon theWeight to becarried by .the rollers andthe contour of the/track which `lhave subsequently described which rides upon them. The boss B3 extendsup a `considerable distance above the bottom Wall of the housing B1 andcontains a bearing `sleeve BG anchored thereon against rotation .andheld in position on a vertical axis. BY is a shaft rotatably andslidable mounted in the bearing sleeve BG and extending vupvvardlytherefrom.

Gis an annular casing resting` upon the bed A. This annular casingcarries a frame C1 made up of angle .iron members extending `rad'mllyinward `and rigidly attached to alconical drum C2. This conical drum hasrigidly mounted in ita bearing sleeve C3 in `line with thefbearingsleeve B6 the shaft B'r being rotatabl)7 and slidablyniounted init. y

'C4 a bracket integral with the conical ,drum C2. ItcarriesbeaningsC5 inwhich the shaft C is rotatably mounted. `One end .of this shaft carriesdriving pulleys CT adapted `to be driven y `source of `povver .not hereshown. On the .from any suitable inner end` of this As'hait 4C is abevelpinion C3 `in mesh with a bevelgear C9 feathered on fthe `shaft B7.y

D lDl are bracket members mounted 4on .the

wardly from the member D1 bearing C3 adapted, engaging as they do theupper and lower surfaces of the hub D2, to hold the bevel gear C9against vertical movement while in no way interfering with its rotation.Da is a sleeve projecting upenlarged as at D4 to provide an oil chamber.The shaft B7 terminates at such enlarged portion carrying on its upperend a thrust washer D5 in rotatable engagement with a stub shaft D6which stub shaft is feathered in the sleeve D3 so that while free tomove longitudinally it is held against rotation. D7 is a springsurrounding the reduced part of such stub shaft engaging a shoulder D8at one end and a bracket D9 at the other, the bracket D9 being heldadjustably toward the sleeve D3 by the bolts D10 whereby the tension onthe spring D7 may be adjusted to yieldingly hold the shaft B7 in itsdownward position.

E is a feed chute extending inwardly through the conical drum C2. Itdischarges against a distributing cone E1 which cone is mounted on theshaft B7 being held in position thereon by means of the set screw E2.This cone terminates in upwardly extending sleeve E8 extending upoutside of the bear'- j ing sleeve C3 to protect it. E4 is a screen hubkeyed on the shaft B7. It terminates in a downwardly extendingcylindrical flange E5 extending down outside of the housing B2. Itcarries a track E6 provided with diametrically opposed high and lowpoints as indicated adapted to rest upon the rollers B5. The track androllers are inclined so that they tend to center on one another. E7 E7are a series of radially arranged spring bars mounted at their innerends on brackets ES projecting outwardly from the flange E5 and at theirouter ends on a supporting ring E9 which joins the4 outer ends of all ofthe spring bars. This arrangement provides a skeleton frame for thescreen upon which the screen sections may be removably supported and bywhich they are yieldingly supported or sprung so as to modify the suddenjarring action caused by the eoperation of the roller and corrugatedtrack.

F F are a series of supporting dogs slidably mounted Aon the spring barsE7. These dogs have upwardly extending bosses F1 in which arescrewthreaded holding screws F2 which are adapted when tightened on theclamping bars F3 to hold the screen sections removably in position. Thescreen sections thus are illustrated in Fig. 3. They comprise a seriesof concentric rigid segments f4 f4 and radial arms f6 f6 arranged in anysuitable manner as indicated to make a stiff and rigid pie shaped frameupon which the screen cloth f8 may be stretched and riveted, bolted orotherwise fastened. These screen sections when brought together edge toedge with a spring bar underlying each radial junction line and whenbolted in position furnish a continuous circular screening surface. Itwill be understood that the screen cloth projects inwardly beyond theframe, rests upon the member E4 and is there clamped in position bymeans of the member E1 so that there is a continuous uninterruptedsupport for the material down the surface of the member E1 on the screencloth thence out to the periphery 'of the screening surface.

G G are spray pipes adapted to spray water or other liquid on the uppersurface of the screen. A valve G1 is provided whereby the supply ofliquid through the supply pipe G2 may be controlled. These spray pipesare located immediately beneath the angle iron member C1 and are coveredby the wood, floor or cover G3 supported upon such angle frame. G4 G4are lower spray pipes adapted to project a series of jets upwardlyagainst the under surface of the screen. The valve G5 is provided tocontrol the supply of material through the supply pipe G6. G7 is a guardring surrounding the outer periphery of the screening member butoverhung by the screening surface. A cone G8 is provided leading fromsuch guard ring to discharge inwardly into the hopper A thus preventingthe discharge by centrifugal force of any screened beneath the screeningsurface.

The annular casing C is reinforced by bracket members H extendingbetween the frame A and the upper frame part C1 so as to distribute theload and tie the parts together and hold them rigidly in properposition.

It will be evident that while I have shown in my drawings an operativedevice, still many changes might be made both in size, shape andarrangement of parts without departing materially from the spirit of myinvent-ion and I wish, therefore, that my drawings be regarded as in asense diagrammatic.

The use and operation of my invention are as follows The screen isrotated by power applied as indicated. It travels at a suiiciently highrate of speed to insure that the material will travel down from thehigher center and be material from Sil discharged away from theperiphery. It is not necessary that the speed be very great becausethere is a sufhcient incline to assisi` the passage of the material andbecause the vibration which is given to the material reduces theresistance to outward movement. The material is fed to the center of thescreen, passes down over the solid conical uide member out onto thescreen sections. s the screen rotates the track which supports ittravels over a fixed roller and since this tra-ck is corrugated orirregular there is a continuous more or less violent up and downmovement of the central screen supporting hub. This violent up and downmovement `tion may *be varied for differentncircumnee/inse if lthewholescreeniwere subjected to it with rigid pants would soon result incompletely breaking up the apparatus particularlythe screen 'fabricitself and wouldvery materially addtogthepowerrequired. ln my inventionthe screen is therefore spring su pported on the central vibrating hubby means oil the radialspring barsas indicated. It will be noted thatthe rigidscreen sections are Supported .on the `spring bars toward`their `outer ends,

that there is no support adjacent the inner ends but that there .is a`support at the center `ofeach screen section. The result of this isthat the spring bars 4have sufiicient room to operate and there is a.continuous dancing movement of the `.particles as they travel alongthescreen caused bythe vibrating os cillation `of, the lscreen surface thisresulting from the sprung connection between the vibrated member 1andthe supjiorting screen frames.;

Vllhe.nfaterjets may or` maynot be used. The `upper jets ofcourseoperate to distributethemateriali and assist inscreening it.

`The lower jets while they alsodistributethe material outwardly assistinforcing particles back through the screen to preventblinding orclogging of the `apertures inthe screen.. j. y y y ift will be clear`that the degree of oscillastances. For instance, intreating someymaterialsit might `be necessaryto have both a very Aviolent oscillationand a very full supn ply of distributing and cleaning liquid jets. Othermaterials.l might be satisfactorily cleaned with very much. less jvilnation` or with, much less liquidonmoisture or with much liquid andlittle vibration or thereverse. rln other words the operator will,depending upon circumstances, supply more or less liquid` and will.depending on circumstances use a track having, greater or smallercorrugations as the case may be.; n i-have shown the screen section asbeing a fabric. Clearly the same cleaning result canbe obtained withascreen made of other material. lltmight be metal or wire or wood oritmight be merely a perforated plate.

lt will be` noted that the vibratory more ment 0f thescreen sectionsjsalong a line substantially perperdicular" to the screen ,itself sothatthe screen is essentially selfwcleaning. ylhe arism 3 in connectionwithscreening, where difiicultics so frequently the vi iatonymovement isinclined to the plane of .the screen cannot here arise.` The centrifugalarrangement,` of course, provides .an exceednigly large screening areabecause the material takes a spiral path and does not `merely travelalone; radial lines. lt goes "from the centralpoint to the dischargearea. l` have illustrated my device as a single screen. @bviously thisapparatus owing to its relatively low height and` light weight zontallydisposed yieldingly screening surface means for rotating it,

can be` built each one as battery. "llhe screens might be arranged oneabove another onseparate or onthe same shaft as the `case lmay be.`

rlthe spring which holds the shadtV down against the supporting trackwill prevent jumping or jarring of the driving apparatus and hold theparts rigidly `in position. so that the only springing or dancing or`trembling will be a resultant of `the movement of the roller `and trackwith respect one to another. rlhere will be nofdancing or bobbing aboutof the central shaft other than the control. movement. This makes itpossible to closely `and accurately control the operation of the screenitself.

The separate screen sections as they wear away or require to be changedcan easily be withdrawn from the apparatus merely by releasing theholdinglbolts when new sections may be inserted to replace them or newscreens may be added to the old sections. This is done, of course,without interfering in any way with the support of the screen on thespring" bars and does not in any way change the assembly or operation ofthe device. i y i The support is at the center, the arms swing free,thusgreater amplitude and viollen'ce of vibration occurs at the outsidejor jdischarge part of the screen. This tends to equalize the amount of `workdone` by the `different parts of the screen because in orditached to thedriving shaft, means "for" vibrating it, and means for feeding materialto it. l f x 2. A centrifugal screen comprising a horizontally disposedyielding supported.

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screening surface means for rotatingiasaid yielding supporting meansbeing rigirlljv attachedtothe driving shadt,` means for vibratingia andmeans for feeding material to it said supporting and vibrating meansconrprising a member and means for moving it vertically and a springresisting the movement of such member. i

3. llt centrifugal screen comprising a horisupported.

means for vibrating it, and means for feeding` material to it theyielding support-ing means comprising radially arrangedspring bars ofcentral anchoage forthem and means for moving it up and down along a'vertical' line.

4. A centrifugal screen comprising a horizontally disposed yieldinglysupported screening surface means for rotating it, said yieldingsupporting means being rigidly attached to the driving shaft, means forvibrating it, and means for 'feeding material to it the screen memberbeing free to oscillate about'the central spring support.

5. A centrifugal screen comprising a horizontally disposed yieldinglysupported screening surface means for rotating it, said yieldingsupporting means being rigidly attached to the driving shaft, means forvibrating it and means for feeding material to it said supporting meansand vibrating means ycomprising a member and means for moving itvertically and a spring resisting the movement of such membeigthe screenmember being free to oscillate about the central spring support.

6. A centrifugal screen comprising a horizontally disposed yieldinglysupported screening surface means for rotating it, means for vibratingit, and means for feeding materialto it the yielding supporting lmeanscomprising radially arranged spring bars of central anchorage for themand means for moving it up and down along a `vertical` line the rscreenmember being free to oscillate about the central spring support.

7. A centrifugal screen comprisinga hub, spring arms projectingoutwardlyfromv it, a ring engaging the outer ends of said arms, means forrotating said hub, means for oscillating it along a vertical line and ascreeny surface mountedon the arms of the ring. j

8. A centrifugal screen comprising a hub, spring armsprojectingoutwardly from it, a ring engaging the outer ends of said arms, meansfor rotating said hub, means for oscillating it along a vertical lineand a screen surface mounted on the arms of the ring such surface madeup of a series of separate segments vwhich are removably mounted.

9. A centrifugal screen comprising a hub, spring arms projectingoutwardly from it, a

ring engaging the outer ends of said arms,`

means for rotating said hub, means for oscillating it along a verticalline and a screen surface mounted on the arms of the ring such surfacemade up of a series of separate segments which are removably mountedeach segment being in engagement with adjacent segments on either sidethere being a spring arm between each engaging line.

10; A centrifugal screen comprising a hub, spring arms' projectingoutwardly from 1t, a ring engaging the outer ends of said arms, meansfor rotating said hub, means vfor oscillating it along a vertical lineand a screen surface mounted on the arms of the ring such surface madeup of a series of separate segments which are removably mounted suchsegments being themselves rigid.

11. A centrifugal screen comprising a hub, spring arms projectingoutwardly from it, a ring engaging the outer ends of said arms, meansfor rotating said hub, means for oscillating it along a vertical lineand a screen surface mounted on the arms of the ring such surface madeup of a series of separate segments whichare removably mounted leachsegment being 1n engagement with adjacent segments on either side therebeing a spring arm between each engaging line such segments beingthemselves rigid.

12. A centrifugal screen comprising a hub, spring arms projectingoutwardly from it, a ring engaging the outer ends of said arms, meansfor rotating said hub, means for oscillating it along a vertical lineand a screen surface mounted on the arms of the ring such surface madeup of a series of separate segments which are removably mounted suchsegments being themselves rigid each segment being attached to each armat two separated points.

13. A centrifugal screen comprising a hub, spring arms projectingoutwardly from it, a ring engaging the outer ends of said arms means forrotating said hub, means for oscillating it along a vertical line and ascreen surface mounted on the arms of the ring such surface made up of aseries of separate segments which are removably mounted each segmentbeing in engagement with adjacent segments on either side there being aspring arm between each engaging line such segments being themselvesrigid, each segment being attached to each arm at two separated points.

14;. A centrifugal screen comprising a horizontally disposed yieldinglysupported screening surface means for rotating it, said yieldingsupporting means being rigidly attached to the driving shaft, means forfeeding materialto it, and means for vibrating it separate from theyielding supporting` idly attachcd t0 the driving shaft, means' Lampesfor Vibrating it, means for feeding material to it the screen memberbeing free t0 Oscillate about the central spring:I support, and meansfor vibrating it separate from the yielding' supporting; means.

17. A centrifugal screen comprising a horizontally disposed yieldinglysupported screening surface means for rotating it, said yieldingsupporting means being rigidly attached to the driving shaft, means forvibrating it and means for feeding material to it, said supporting meansand vibratingr means comprising a member and means for Copies of thispatent may be obtained for moving' it vertically and a spring resistingthe movement of such member, the screen member being tree to Oscillateabout the cen tral spring support, and means for vibrating it separatefrom the yielding supporting; means.

ln testimony whereof, ll aiiix mysignature in the presence of a Witnessthis 11th day of July, 1917.

@SCAR M. GRUENDER.

Witness:

g MrNNin M. LINDENAU.

frire cents each, by addressing the Commissioner or Patente,

Washington, D. IU.

